HP 220 - Manual (Page 167)

8Ć19 Removal and Replacement C3187Ć90000
Test Description
Media-Sensor Test This tests the following:
D Media sensor on entry platen
D Main PCA
D Media opacity
Pinch-Arm-
Sensor Test This tests the following:
D Pinch-arm sensor
D Pinch-arm-sensor cable
D Main PCA
Service
Configuration Plot The service configuration plot contains the following:
D Hard-clip border around the plot enabling you to measure the margins.
D Unique bar patterns enabling you to detect print-quality problems
D Four X-shaped marks (crosshairs) for measuring the accuracy of the
media-axis calibration. (The centers of the crosshairs should be 500 mm
apart.)
D Contents of EEROM, dumped in hexadecimal format.
D Explanation of important EEROM parameters, including a mileage monitor
and information on the last system error.
D Designation of front-panel keys for service tests.
Service Monitor
(Data Display) Use the service monitor to compare the code sent by the computer with that
received by the plotter. Instead of plotting the drawing that you send, the plotter
prints part of the code that would otherwise have been used to plot the drawing.
This code is useful when you suspect that there is a problem with the
communication between the computer and the plotter.
Servo/Encoder Test The servo/encoder test performs the following:
D MediaĆaxis encoder test
: Verifies the operation of the servo loop
(Media-axis feedback).
D CarriageĆaxis encoder test : Verifies the operation of the servo loop
(Carriage-axis feedback).
D Records the maximum pulse-width modulations used. You can view this
information on the service configuration plot.